These face shields are intended as an alternative to eye protection that is in short supply. They do nothing for respiratory protection. Infection via the eyes is primarily a concern for people interacting closely with contagious patients (i.e. healthcare workers).
To answer your seemingly underlying question: no, if Apple gave you a face shield it doesn't mean you get to go outside.
If no one is going outside, how are there any new cases? Lots of people are "essential workers", they go to the grocery store, the pharmacy, etc.
Yes, HCW exposure is much greater than the average person, but your argument is essentially: Since you aren't driving in a Formula 1 race where the risk of crashing is higher, there's no need to wear a seatbelt.
When we're seeing hundreds of deaths per year from COVID, I'll agree with you, but currently, HCW or no, COVID is one of the biggest threats to your life, and you'd be an idiot to go outside without the best protection you can get your hands on.
To answer your seemingly underlying question: no, if Apple gave you a face shield it doesn't mean you get to go outside.